Accession Number:

ADA232624

Title:

In-Situ Surface X-Ray Scattering Measurements of Electrochemically Deposited Bismuth on Silver (III): Structure, Compressibility, and Comparison with Ex-Situ Leed Measurements

Descriptive Note:

Summary rept.,

Corporate Author:

PUERTO RICO UNIV RIO PIEDRAS DEPT OF PHYSICS

Report Date:

1991-01-29

Pagination or Media Count:

31.0

Abstract:

We report in-situ surface X-ray scattering measurements of the structure and compressibility of electrochemically deposited Bi monolayers on AgIII and compare the in-situ structure with results from previous ex-situ experiments on emersed electrodes, where the structure was studied with low- energy diffraction LEED. We find that the Bi monolayer forms an unusual structure a two-dimensional rectangular lattice is uniaxially commensurate with the hexagonal Ag III surface along the Ag211 direction. There are two Bi adatoms per rectangular unit cell and one adatom is displaced from the centered- rectangular position by approx. 0.25a along the commensurate direction. The displacement shortens two of the Bi-Bi near-neighbor bond distances but lengthens two others and may reflect the tendency toward covalent bonding in Bi. With increasing coverage Decreasing applied potential, the Bi monolayer compresses uniaxially along the incommensurate direction Ag011, which preserves the uniaxially commensurate structure.

Subject Categories:

  • Atomic and Molecular Physics and Spectroscopy
  • Nuclear Physics and Elementary Particle Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE